Wooden panel



o =t. 19, 1943.f ;G M, HUNT HAL 2,332,081

WOODEN PANEL Filed Aug. 6, 1942 Fire-Resistive Material 3 ENTORS G.M.HUNT

0.0. MCNAUGHTON Fatented Oct. 19,1943 1 iJNlTED \STATES' PATENT OFFlCE WOODEN PANEL George M. Hunt, George C. McNaughton, and Theodore J. Martin, Madison,-Wls.; dedicated to the free use of the People in the territory of the United States Application August 6, .1942, Serial No. 453,776

2 Claims. (01. 20-41) (Granted under the act or March 3, 1883,. as amended April so, 192;; 370 0. G. 151) I This application .is made under the act of Figure 3 is an exploded view of a pair of strips March 3, 1883, as amended by the act or April showing th end to end joint structure 30, 1928, and the invention herein described, i In the drawing; i represent wooden Strips of patented, may be manufactured and used by or any desirable dimensions and number. The for the Government f the United "States of 5 strips are formed at the joining edges with America for tal purposes without the matching grooves 2 in which are fitted fire-repayment to us of any royalty thereon. I e sistive strips or splines 3, made of fire-resistive We hereby dedicate the invention herein dematerial, such as asbestos millboard (which is scribed to the free use 0f, th people in the terpreferred), asbestos cloth, glass cloth, mica, itory of the United .States to take eilect-on the 10 porcelain, fire-resistive wood or plywood, or ranting of a patent to us. materials coated with fire-retarding prepara- This invention relates to wooden panels and tions, etc. Such materials are both DOD-3Comthe manner of constructing such a panel bustible and non-conductive. Thus the splines from edge joined strips. bridge the seams or joints between adjacent Ordinarily, wooden panels are formed from a l5 strips to block passage of fire. plurality of strips cut lengthwise of'the grai The strips are also formed at their joining and joined edge to edge. Glues, such as anlends with matched cross grooves 4 in which are Starch, i e e e P nd many fitted short pieces 5 of fire-resistive material synthetic resins, when used for joining, release bridging the end joints. It is not essential, their bond when exposed to fire. This, together I however, that the end joints be fire-proofed and with shrinkage oi the wood, which is greater i the end grooves l and pieces 5 may be omitt the transverse than in the longitudinal direc- The strips are glued together, and are providedtion of the grain, causes the joints to open. with suitable crossbands 6 to hold them assemforming cracks through which the .fire Passes. bled, since the splines, because of the'nature of thus greatly reducing the fire resistance of the the material, are not structurally strong. The e crossbands are covered with suitable veneers I. Prior attempts to improve the fire resistance The particular .arrangements 0! parts herein 01 panels v been d example. I disclosed are illustrative of but one embodime t, strips have been joined with a ton an g oove of the invention, which is not limited thereto joint. However, th i wasteful of material a except as required by the appended claims.

does not satisfactorily increase the fire resist- Having thus described our invention, we ance. When the strlpsshrink away from each claim: e J other and the tongue burns through, cracks yet 1. A. panel comprising wooden strips joined remain. In other attempts sheets of woven along their edges with glue, each strip having asbestos cloth havebeen placed on a panel or at least one groove in its edge matching groove ma under the crossbands. However, this is in the edge, of the adjoining strip, an asbestos expensive and involves difllculties in gluing or millboard spline fitted in the matching grooves otherwise attaching the asbestos sheets.- and bridging the joint between the strips, cross- An object or this invention'is to improve t bands coverlngthe strips on both sides or the me resistance! wooden panels brmm the 40 panel, and. veneers covering the crossbands. 1 t8 between component pieceg less vulnerable 2. A panel comprising wooden strips joined 13 along their hedggagach strip having at least l one groove i e ge matching the groove in P cqnsmmted a to 52:82:; the edge of the adjoining strip, an asbestos 3" suitable use "core millboard spline fitted in the matching grooves bulkheads, etc. and are Specifically a and bridgingthe joint between the strips, crossin the accompanyi drawing in which f bands covering the strips on both sides of the Figure 1 is a-l i sectmnalfltw 9 panel, and veneers covering the crossbands. corner portion 01 the p n 1 GEORGE HUNT- p Figure 2 is an exploded view oi a pair 01 Strip! so GEORGE G. McNAUGETON.

showing the edged joint structure. and J. MARTIN. 

